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Quarterly Financial Information (Tables)
 12 Months Ended
Dec. 31, 2017
Schedule Of Quarterly Financial Information [Abstract]  
Schedule of Quarterly Financial Information [Table Text Block]
NORTHWEST NATURAL GAS COMPANY
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
 
 
Quarter ended
In thousands, except per share data
 
March 31
 
June 30
 
September 30
 
December 31
2017
 
 
 
 
 
 
 
 
Operating revenues
 
$
297,323

 
$
136,238

 
$
88,190

 
$
240,422

Net income (loss)
 
40,310

 
2,729

 
(8,495
)
 
(90,167
)
Basic earnings (loss) per share(1)
 
1.41

 
0.10

 
(0.30
)
 
(3.14
)
Diluted earnings (loss) per share(1)
 
1.40

 
0.10

 
(0.30
)
 
(3.14
)
2016
 
 

 
 
 
 

 
 

Operating revenues
 
$
255,529

 
$
99,183

 
$
87,727

 
$
233,528

Net income (loss)
 
36,641

 
2,019

 
(8,040
)
 
28,275

Basic earnings (loss) per share(1)
 
1.33

 
0.07

 
(0.29
)
 
1.01

Diluted earnings (loss) per share(1)
 
1.33

 
0.07

 
(0.29
)
 
1.00

(1)
Quarterly earnings (loss) per share are based upon the average number of common shares outstanding during each quarter. Variations in earnings between quarterly periods are due primarily to the seasonal nature of our business.